title: [Average length of spontaneous labor in Chinese primigravidas].
abstract: OBJECTIVE
  To determine if labor duration is affected by ethnicity, we measured the average length of normal spontaneous labor in recently immigrated Chinese primigravidas and compared our findings to reference primigravida populations of differing ethnicity.
  
  
  METHODS
  In this descriptive, retrospective study of 1,006 recently immigrated low-risk Chinese primigravidas delivering singleton, vertex, term infants (37-42 weeks gestation, inclusively) without conduction anesthesia or oxytocin, the length of first-, second-, and third-stage labor, maternal age, gestational age, and infant weight was measured and compared to labor lengths previously reported for women of differing ethnicity.
  
  
  RESULTS
  Mean first stage labor duration was 326 minutes (SD +/- 185 min, range 25-1640 min), mean second stage labor duration was 52 minutes (SD +/- 42 min, range 2-450 min), and a mean third stage labor duration was 4.6 min (SD +/- 4.5 min, range 1-62 min). Interquartile range (IQR)/median for first-, second-, and third-stage labor was 225 min/300 min, 50 min/40 min, and 3 min/3 min respectively. Weak correlations were observed between first- and second-stage labor lengths, and second- and third-stage labor lengths. Average birth weight was 3250 g (SD +/- 376 g, range 2280-4660 g). Chinese parturients showed a significantly shorter duration of first-stage (P < 0.0001) when compared to parity-matched patients of differing ethnicity. Second-stage labor in Chinese parturients was also shorter, but did not differ significantly (P = 0.185) from previously reported non-Asian controls.
  
  
  CONCLUSIONS
  When compared to previously collected data from non-Chinese women, clinically significant differences in first-stage labor lengths were measured in our study population. While second-stage labor durations were also shorter, the difference was not significant. Labor management should be individualized to account for these differences, and previous reports attempting to show equivalency of labor progress regardless of ethnicity warrant reinterpretation given these findings.
authors.affiliation: Department of Obstetrics & Gynecology, New York Hospital-Cornell Medical Center, New York 10021, USA.
authors.forename: E S
authors.initials: ES
authors.lastname: Sills
authors.forename: J D
authors.initials: JD
authors.lastname: Baum
authors.forename: X
authors.initials: X
authors.lastname: Ling
authors.forename: M M
authors.initials: MM
authors.lastname: Harper
authors.forename: D P
authors.initials: DP
authors.lastname: Levy
authors.forename: C J
authors.initials: CJ
authors.lastname: Lockwood
mesh_terms: D044466:Asian People; D001724:Birth Weight; D002681:China / Q000208:ethnology; D004641:Emigration and Immigration; D005260:Female; D005865:Gestational Age; D006801:Humans; D007743:Labor, Obstetric / Q000502:physiology*; D008423:Maternal Age; D009519:New York City; D010298:Parity; D011247:Pregnancy; D012189:Retrospective Studies; D013997:Time Factors
vernacular_title: Durée moyenne du travail spontané chez les primipares chinoises.